Examlex
_____ first used the process of freeze-drying.
Blastula
An early stage of embryonic development in animals, characterized by a sphere of cells surrounding a central fluid-filled cavity.
Morula
Mass of 12 or more cells resulting from the early cleavage divisions of the zygote.
Placenta
An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to, and removing waste from, the fetus.
Trophoblast
A layer of cells surrounding the blastocyst in early development that provides nutrients to the embryo and develops into part of the placenta.
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